The coded signal is received by satellite dish aerials.编码信号由碟形卫星天线接收。Dish aerials are highly directional.碟形卫星天线的定向性非常强。Are the ship's main radio transmitter aerials earthed and radars switched off?液货船上主无线电发射机天线已接地且雷...
the process of decontaminating areas exposed to radioactivity清除受放射污染地区有害物质的过程The soil contains 30 times the acceptable level of radioactivity.这片土壤受到了高于标准30倍的辐射.The site was found to be contaminated by radioactivity.发现此地受...